Each Ruger American Rimfire™ rifle includes two interchangeable stock modules that provide comb height options for scope or iron sight use. Standard models come with long length of pull modules, while compact models come with short length of pull modules. By simply removing the rear sling swivel stud, stock modules can be changed in seconds. Models chambered in .22 Magnum use the detachable, flush-mounted JMX-1 9-round rotary magazine